package com.hmdp.utils;

import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
@Slf4j
public class RedisIdWorker {
    //1、开始时间戳
    private static final long BEGIN_TIMESTAMP = 1640995200L;
    //2、序列号位数
    private static final int COUNT_BITS = 32;

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    public Long nextId(String keyPrefix){
        //1、生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond - BEGIN_TIMESTAMP;

        //2、生成序列号
        //2.1 获取当前的日期 精确到天
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        Long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);

        //3、拼接并返回
        return timestamp << COUNT_BITS | count ;
    }
    public  static void  main(String[] args){
        LocalDateTime time = LocalDateTime.of(2022, 1, 1, 0, 0, 0);
        Long second = time.toEpochSecond(ZoneOffset.UTC);
        System.out.println(second);
    }
}
